Fluorescence images of extracted cells after 5 min incubation followed by three magnetic washes with (a) Rubpy dye-aptamer conjugates (40 μM) and (b) Rubpy nanoparticle-aptamer conjugates (0.5 nM). (c) Comparative plots between dye-labeled cells and NP-labeled cells by flow cytometric analysis, reprinted with permission from [55], Copyright 2006 American Chemical Society.
